- Place water chestnuts between 2 paper towels, and press down to remove excess moisture.
- Using a food processor, chop water chestnuts and onion to a coarse meal, then add egg and salt, and process for 10 secs. Transfer to a bowl, add beef, oyster sauce and bread crumbs and combine thoroughly. Using your hands, form mixture into balls the size of walnuts.
- Heat a fry pan over medium – high heat. Add oil and cook patties until golden brown and cooked through for 4-5 mins.
- Cook sweet and sour sauce and spring onion gently for 5 mins. Add patties to sauce and serve.